EP0463249A1 - Douille à billes - Google Patents

Douille à billes Download PDF

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Publication number
EP0463249A1
EP0463249A1 EP90307077A EP90307077A EP0463249A1 EP 0463249 A1 EP0463249 A1 EP 0463249A1 EP 90307077 A EP90307077 A EP 90307077A EP 90307077 A EP90307077 A EP 90307077A EP 0463249 A1 EP0463249 A1 EP 0463249A1
Authority
EP
European Patent Office
Prior art keywords
bushing
bearing
ball
channels
linear bearing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90307077A
Other languages
German (de)
English (en)
Inventor
Conrad Erwin Fredericks
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP90307077A priority Critical patent/EP0463249A1/fr
Publication of EP0463249A1 publication Critical patent/EP0463249A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C29/00—Bearings for parts moving only linearly
    • F16C29/04—Ball or roller bearings
    • F16C29/06—Ball or roller bearings in which the rolling bodies circulate partly without carrying load
    • F16C29/068—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with the bearing body fully encircling the guide rail or track
    • F16C29/0683—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with the bearing body fully encircling the guide rail or track the bearing body encircles a rail or rod of circular cross-section, i.e. the linear bearing is not suited to transmit torque
    • F16C29/0685—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with the bearing body fully encircling the guide rail or track the bearing body encircles a rail or rod of circular cross-section, i.e. the linear bearing is not suited to transmit torque with balls
    • F16C29/0688—Ball or roller bearings in which the rolling bodies circulate partly without carrying load with the bearing body fully encircling the guide rail or track the bearing body encircles a rail or rod of circular cross-section, i.e. the linear bearing is not suited to transmit torque with balls whereby a sleeve surrounds the circulating balls and thicker part of the sleeve form the load bearing tracks

Definitions

  • This invention relates to ball bushings and is concerned with so-called radial and tangential ball bushings of the kind which are intended to facilitate the linear, rather than rotary, displacement of one item relative to another.
  • ball bushings or shaft bearings are quite well known per se and a good example thereof can be found in GB-A-1574258 to which reference may be made for constructional details of such a bushing or bearing.
  • bearings or bushings are commonly employed in, purely for example, the support of linearly displaceable machine tool parts and the like, their construction must be carried out very carefully if they are to be, as is required, long lasting and this inevitably makes them somewhat expensive.
  • the principal difficulty in producing known bearings or bushings of this general kind is that they require an initially separate ball guidance cage but it has now been discovered that bearings or bushings of the kind under discussion, and that have the required durability, can be produced less expensively by employing a construction which omits a separate ball guidance cage.
  • the present invention is based principally upon this development.
  • a linear bearing or bushing comprising a shell in which is formed a plurality of "loaded” ball channels and a plurality of spaced but parallel “unloaded” or return ball channels, the bearing or bushing also comprising end caps each of which exhibits a plurality of curved transfer channels interconnecting the ends of pairs of the "loaded” and “unloaded” ball channels.
  • the "loaded” and “unloaded” or return ball channels are formed in an initially separate ball guidance cage, the cage being formed by machining or moulding and finishing depending upon the particular material from which the cage is formed.
  • the "loaded” and “unloaded” or return ball channels extend strictly parallel to the longitudinal axis (axis of linear displacement) of the bearing or bushing, the “loaded” channels opening internally through the body of the bearing or bushing so that the balls which they will contain in use abut against a shaft or other member.
  • a line 1 can be seen in Figure 5 of the drawings and this line designates the outer curved surface of a shaft or the like with which, in use, the linear bearing or bushing will co-operate.
  • Figure 5 illustrates only part of one of the end caps of the bearing or bushing
  • the shell or body thereof will, in use, be disposed immediately below the end cap of Figure 5 and the line 1 will continue downwardly into that body so that the bearing balls contained in the "loaded” channels will project internally through the wall of the body of the bearing or bushing, as they do through the material of the end cap, into bearing contact with the shaft or the like that exhibits the surface 1.
  • Figure 2 of the drawings is a side view of an end cap of a linear bearing or bushing in accordance with the invention
  • end cap may, for example, be a so-called 40 millimetre standard ball bush end cap which may conveniently, but not essentially, be formed as a zinc casting, it being remembered that other metallic and/or synthetic plastics and/or ceramic and/or cermet materials may be employed if desired and/or if appropriate.
  • the end cap is stepped and has an outer portion 2 and an inner portion 3 of smaller diameter that cooperates with the shell or body (not shown) of the linear bearing or bushing.
  • the outer portion 2 of the end cap has a diameter of 51.5 mm whereas the inner portion 3 thereof has a diameter which may vary between 45.8 and 45.9 mms depending upon the particular way in which the linear bearing or bushing is to be used.
  • the different possibilities in this respect are discussed in GB-A-1574258.
  • the end cap may have an axial length or thickness of 12 mm and the inner portion 3 thereof may have an axial length or thickness of 2.9 mm.
  • Figure 1 shows the position of ten equi-spaced curved transfer channels 4 and it will immediately be apparent that such channels 4 are spaced apart from one another at regular intervals around the longitudinal axis (axis of linear displacement) of the end cap concerned.
  • Figure 1 also shows the positions of three holes 5 which, in use, will register with screw-threaded bores in the shell or body of the bearing or bushing. These holes 5 receive bolts by which the end cap concerned is securely fixed to the shell or body of the bearing or bushing.
  • One of the holes 5 can also be seen in Figure 5 of the drawings and it will be apparent from the Figure that, preferably, the bolts (or screws) which are employed are cheese-head bolts or screws operable by Allen keys whereby their heads will be recessed when the bolts are tightened.
  • Figures 3, 4 and 5 of the drawings show principally how the illustrated metallic end cap is formed. It has been found that the necessary curved transfer channels 4 can be formed by the use of a vertical ball end or ball nose slot mill and the reference 6 that appears in Figure 5 of the drawings indicates the direction of approach of such a 3.5 mm diameter slot mill. The shapes and dispositions of the ten transfer channels 4 will be evident from Figure 1 of the drawings where two of those channels 4 are illustrated.
  • Figure 3 shows the parabolic path cut by the slot mill and it will be noted that said path has a major axis 7 which, in the case of the example that is being described, has a 7 mm dimension whereas the minor axis 8 thereof has a 4.4 mm dimension.
  • the "loaded” and “unloaded” channels in the shell or body of the bearing or bushing and the transfer channels 4 in the end caps thereof all have a so-called conformity radius which is preferably 1.06 x the radius of each bearing ball that, in use will be movably accommodated therein.
  • This arrangement allows free movement of the bearing or bushing, without significant lateral deviation, along a strictly linear path whilst substantially completely avoiding jamming.
  • the slots through which the bearing balls project internally of the "loaded" channels of the body of the bearing or bushing and the similar slots which extend for short distances in the end caps thereof are significantly narrower in width than the diameters of the bearing balls themselves so that said balls cannot become lost from the channels in question through those slots when the bearing is not in surrounding relationship with a shaft or the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bearings For Parts Moving Linearly (AREA)
EP90307077A 1990-06-28 1990-06-28 Douille à billes Withdrawn EP0463249A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP90307077A EP0463249A1 (fr) 1990-06-28 1990-06-28 Douille à billes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP90307077A EP0463249A1 (fr) 1990-06-28 1990-06-28 Douille à billes

Publications (1)

Publication Number Publication Date
EP0463249A1 true EP0463249A1 (fr) 1992-01-02

Family

ID=8205469

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90307077A Withdrawn EP0463249A1 (fr) 1990-06-28 1990-06-28 Douille à billes

Country Status (1)

Country Link
EP (1) EP0463249A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1574258A (en) * 1978-05-19 1980-09-03 Fredericks C Linear ball bearings
GB2134603A (en) * 1983-01-29 1984-08-15 Hiroshi Teramachi Ball spline bearing
US4799803A (en) * 1987-09-16 1989-01-24 Nippon Thompson Co., Ltd. Ball spline linear motion rolling guide unit
CH670684A5 (en) * 1987-03-27 1989-06-30 Sferax S A Recirculating linear bearing - has ball bearing tracks with metallic contact rails and return passages formed within carriage body

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1574258A (en) * 1978-05-19 1980-09-03 Fredericks C Linear ball bearings
GB2134603A (en) * 1983-01-29 1984-08-15 Hiroshi Teramachi Ball spline bearing
CH670684A5 (en) * 1987-03-27 1989-06-30 Sferax S A Recirculating linear bearing - has ball bearing tracks with metallic contact rails and return passages formed within carriage body
US4799803A (en) * 1987-09-16 1989-01-24 Nippon Thompson Co., Ltd. Ball spline linear motion rolling guide unit

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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